Power Supply Problems. HELP!

[gachenb@eis.calstate.edu (Greg R. Achenbach)]

OK, I need some advice.  I think I just blew out a power supply on my GS. 
I was having some problems doing a reboot (Apple-Cntl-Reset).  The
thermometer would fill up just like normal, but once it was full, the
computer would freeze and nothing more would happen.  I tried it again and
the same thing happened.  No problem (I thought), I'll just turn off the
power and turn it back on.  NOTHING HAPPENED.  No power light, no nothing. 
I reseated all the plugs and tried again, several times.  No dice.  Is my
power supply history?  If not, what is going on?  If it is dead, where do
I get a new one?  Is this a standard item that an electronics store would
have, or do I need to go the Apple, Inc. route?  I saw another GS that had
a fan mounted on the side of the PS.  Is this an advantage or a gimmick? 
What would be a decent price to pay? 

Thanks in advance.
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Greg Achenbach gachenb@eis.calstate.edu (soon to be ctp.org) Los Angeles
County Outdoor Science School

"Society is like a stew.  If you don't keep it stirred up, you get a lot of
scum on top."  Edward Abbey